| Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
|
41361
| OR | Multnomah | Gary Island Slough, access by boat from Columbia River just east of mouth of Sandy River. | 2001 |
17080001
| Lower Columbia-Sandy | established |
|
297334
| OR | Multnomah | Gary Island Slough, access by boat from Columbia River just east of mouth of Sandy River. | 2009 |
17080001
| Lower Columbia-Sandy | established |
|
297336
| OR | Multnomah | Gary Island Slough, access by boat from Columbia River just east of mouth of Sandy River. | 2013 |
17080001
| Lower Columbia-Sandy | established |
|
41382
| OR | Multnomah | Rooster Rock Slough, north of I-84N at Rooster Rock State Park. | 2001 |
17080001
| Lower Columbia-Sandy | established |
|
297366
| OR | Multnomah | Rooster Rock Slough, north of I-84N at Rooster Rock State Park. | 2009 |
17080001
| Lower Columbia-Sandy | established |
|
297371
| OR | Multnomah | Rooster Rock Slough, north of I-84N at Rooster Rock State Park. | 2013 |
17080001
| Lower Columbia-Sandy | established |